What does it mean when my crush's friends joke about us dating when he's not here

puplecard
I was hanging out with with my brother's friends last night(my brother is 6 years older than me). I liked one of his friends for a few years but he was deployed to Afghanistan 6 months ago. I somewhat told him I liked him and have been in close contact through letters and fb. So last night I was with the guys and all of the sudden they started making couples jokes about me and him... These jokes haven't come out until last night and one in March. Do you think they just know I like him or does it mean they could actually see us as a couple?
What does it mean when my crush's friends joke about us dating when he's not here
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